Blue anthraquinone dye



ilNTTnn STATES PATENT. Omens.-

ROBERT E. SCHMIDT AND PAUL TUST, OF ELBERFELD, GERMANY, ASSIGNORS TO THE FARBENFABRIKEN OF ELBERFELD COMPANY, OF NEIV YORK.

BLUE ANTHRAQUINONE DYE.

SPECIFICATION forming part of Letters Patent No. 605,921, dated June 21, 1898.

Application fil d, December 29, 1897. Serial No. 664,426. (No specimens.) Patented in France May 17, 1897, No. 266,999, and in Italy June 30, 1897, XXXIII, 44,832, and LXXXVII, 382.

T aZZ whom it may concern: If necessary, this dyestuff can be purified by Be it known that we, ROBERT E. SCHMIDT dissolving in a dilute ammonia or sodium-carand PAUL TUST, doctors of philosophy, chembonate solution, filtering the solution thus ists, of Elberfeld, Germany, (assignors to the obtained, and finally precipitating the dye- 5 FARBENFABRIKEN on ELBERFELD COMPANY, stuff with the aid of acids.

of New York,) have invented a new and use- The coloring-matter can be used for dyeing ful Improvement in the Manufacture of Blue purposes either in a pasty state or after pre- Anthraquinone Dye, (for which the Farbenvious drying. When dry and pulverized, it fabriken, vormals Fr. Bayer & 00., has alrepresents a blackish powder, which when I0 ready obtained Letters Patent in France, No. rubbed assumes a metallic luster. It is dis- 266,99 9, dated May 17, 1897, and in Italy, Reg. solved by anilin, pyridin, and dilute alkalies, Gen, Vol. XXXIII, No. 44,832, Reg. Att., such as ammonia liquor or a sodium-carbon- Vol. LXXXVII, No. 382,dated June 30,1897;) ate or sodium-hydroxid solution, with blue and we hereby declare the following to be a color. In concentrated sulfuric acid it dis- I5 clear and exact description of our invention. solves with a yellow color, which turns into Our invention relates to the production of violet-red with a brownish-red fluorescence a new dyestuft, being a monosulfo-acid of on the addition of boric acid.

paradiamidochrysazin having the formula The new coloring-matter dyes unmordanted NH2 N112 Wool in acid-baths beautiful blue shades, 7o 20 which are distinguished by their fastness CO against the action of light. On chrome mordanted Wool it produces greenish-blue shades,

which are very fast to light and milling. Having now described our invention and in 5 CO what manner the same is to be performed,

I I What we claim as new, and desire to secure OH by Letters Patent, is which process consists in treating the para- 1. The production of paradiamidochrysadiamidochrysazin with a suitable sulfonating zin-monosulfo-acid by a sulfonation of para- 3 agent, such as fuming sulfuric acid or the diamidochrysazin.

like. In performing this process care must 2. The process for producing a monosulfobe taken that detrimental bi-reactions are acid of paradiamidochrysazin which process avoided, which can profitably be effected by consists in sulfonatingthe said body by means adding a suitable agent, such as boric acid. of fuming sulfuric acid with the addition of 35 In carrying out our invention practically boric acid, substantially as hereinbefore dowe can proceed as follows, (the parts being scribed.

by weight:) Ten parts of paradiamidochry- 3. As a new article of manufacture the new sazin are heated, together with two hundred dyestuff, being a monosulfo-acid of paradiparts of fuming sulfuric acid (containing amidochrysazin of the formula 4 about thirty per cent. of S0 and ten parts NH NH of crystalline boric acid, at from 120 to 130 1 2 2 centigrade until the precipitate obtained by OO pouring a test portion of the mixture into 7 water readily dissolves in a diluted soda-lye 45 with a pure-blue color. The liquid is then allowed to cool, and when cool it 'is poured CO c into av large quantity of water. The resulting mixture is filtered. The dark-violet resi- OH OH due remaining on the filter, which represents and representing a blackish powder which 5 our new dyestuff, is washed by means of wawhen rubbed assumes a metallic luster, solu ter until the filtrate shows a neutral reaction. ble in anilin, pyridin and in dilute alkalies with blue color, yieldin with concentrated sulfuric acid (66 Baume) a yellow solution which assumes a violet-red color on the addition of boric acid, dyeing uninordanted Wool in acid-baths beautiful blue shades very fast to light, yielding 011 chrome mordanted Wool greenish-blue shades very fast to light and milling.

In testimony whereof e hzwe signed our names in the presence of two subscribing Wit- 1o OTTO KUNIG. 

